[MacPorts] #44351: Fix phonon cmake install

[MacPorts]

#44351: Fix phonon cmake install
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 Reporter:  springermac@…  |      Owner:  macports-tickets@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.3.1
 Keywords:                 |       Port:  phonon
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 The PhononConfig.cmake file didn't set the rootDir properly and the
 PhononTargets-release.cmake file was using the import directory instead of
 the PHONON_LIBRARY_DIR.

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Ticket URL: <https://trac.macports.org/ticket/44351>
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